git.distorted.org.uk Git - u/mdw/putty/blob - charset/localenc.c

   1 /*
   2  * local.c - translate our internal character set codes to and from
   3  * our own set of plausibly legible character-set names. Also
   4  * provides a canonical name for each encoding (useful for software
   5  * announcing what character set it will be using), and a set of
   6  * enumeration functions which return a list of supported
   7  * encodings one by one.
   8  *
   9  * charset_from_localenc will attempt all other text translations
  10  * as well as this table, to maximise the number of different ways
  11  * you can select a supported charset.
  12  */
  13
  14 #include <ctype.h>
  15 #include "charset.h"
  16 #include "internal.h"
  17
  18 static const struct {
  19     const char *name;
  20     int charset;
  21     int return_in_enum;   /* enumeration misses some charsets */
  22 } localencs[] = {
  23     { "<UNKNOWN>", CS_NONE, 0 },
  24     { "UTF-8", CS_UTF8, 1 },
  25     { "ISO-8859-1", CS_ISO8859_1, 1 },
  26     { "ISO-8859-1 with X11 line drawing", CS_ISO8859_1_X11, 0 },
  27     { "ISO-8859-2", CS_ISO8859_2, 1 },
  28     { "ISO-8859-3", CS_ISO8859_3, 1 },
  29     { "ISO-8859-4", CS_ISO8859_4, 1 },
  30     { "ISO-8859-5", CS_ISO8859_5, 1 },
  31     { "ISO-8859-6", CS_ISO8859_6, 1 },
  32     { "ISO-8859-7", CS_ISO8859_7, 1 },
  33     { "ISO-8859-8", CS_ISO8859_8, 1 },
  34     { "ISO-8859-9", CS_ISO8859_9, 1 },
  35     { "ISO-8859-10", CS_ISO8859_10, 1 },
  36     { "ISO-8859-11", CS_ISO8859_11, 1 },
  37     { "ISO-8859-13", CS_ISO8859_13, 1 },
  38     { "ISO-8859-14", CS_ISO8859_14, 1 },
  39     { "ISO-8859-15", CS_ISO8859_15, 1 },
  40     { "ISO-8859-16", CS_ISO8859_16, 1 },
  41     { "CP437", CS_CP437, 1 },
  42     { "CP850", CS_CP850, 1 },
  43     { "CP852", CS_CP852, 1 },
  44     { "CP866", CS_CP866, 1 },
  45     { "CP1250", CS_CP1250, 1 },
  46     { "CP1251", CS_CP1251, 1 },
  47     { "CP1252", CS_CP1252, 1 },
  48     { "CP1253", CS_CP1253, 1 },
  49     { "CP1254", CS_CP1254, 1 },
  50     { "CP1255", CS_CP1255, 1 },
  51     { "CP1256", CS_CP1256, 1 },
  52     { "CP1257", CS_CP1257, 1 },
  53     { "CP1258", CS_CP1258, 1 },
  54     { "KOI8-R", CS_KOI8_R, 1 },
  55     { "KOI8-U", CS_KOI8_U, 1 },
  56     { "Mac Roman", CS_MAC_ROMAN, 1 },
  57     { "Mac Turkish", CS_MAC_TURKISH, 1 },
  58     { "Mac Croatian", CS_MAC_CROATIAN, 1 },
  59     { "Mac Iceland", CS_MAC_ICELAND, 1 },
  60     { "Mac Romanian", CS_MAC_ROMANIAN, 1 },
  61     { "Mac Greek", CS_MAC_GREEK, 1 },
  62     { "Mac Cyrillic", CS_MAC_CYRILLIC, 1 },
  63     { "Mac Thai", CS_MAC_THAI, 1 },
  64     { "Mac Centeuro", CS_MAC_CENTEURO, 1 },
  65     { "Mac Symbol", CS_MAC_SYMBOL, 1 },
  66     { "Mac Dingbats", CS_MAC_DINGBATS, 1 },
  67     { "Mac Roman (old)", CS_MAC_ROMAN_OLD, 0 },
  68     { "Mac Croatian (old)", CS_MAC_CROATIAN_OLD, 0 },
  69     { "Mac Iceland (old)", CS_MAC_ICELAND_OLD, 0 },
  70     { "Mac Romanian (old)", CS_MAC_ROMANIAN_OLD, 0 },
  71     { "Mac Greek (old)", CS_MAC_GREEK_OLD, 0 },
  72     { "Mac Cyrillic (old)", CS_MAC_CYRILLIC_OLD, 0 },
  73     { "Mac Ukraine", CS_MAC_UKRAINE, 1 },
  74     { "Mac VT100", CS_MAC_VT100, 1 },
  75     { "Mac VT100 (old)", CS_MAC_VT100_OLD, 0 },
  76     { "VISCII", CS_VISCII, 1 },
  77     { "HP ROMAN8", CS_HP_ROMAN8, 1 },
  78     { "DEC MCS", CS_DEC_MCS, 1 },
  79 };
  80
  81 const char *charset_to_localenc(int charset)
  82 {
  83     int i;
  84
  85     for (i = 0; i < (int)lenof(localencs); i++)
  86         if (charset == localencs[i].charset)
  87             return localencs[i].name;
  88
  89     return NULL;                       /* not found */
  90 }
  91
  92 int charset_from_localenc(const char *name)
  93 {
  94     int i;
  95
  96     if ( (i = charset_from_mimeenc(name)) != CS_NONE)
  97         return i;
  98     if ( (i = charset_from_xenc(name)) != CS_NONE)
  99         return i;
 100
 101     for (i = 0; i < (int)lenof(localencs); i++) {
 102         const char *p, *q;
 103         p = name;
 104         q = localencs[i].name;
 105         while (*p || *q) {
 106                 if (tolower((unsigned char)*p) != tolower((unsigned char)*q))
 107                 break;
 108             p++; q++;
 109         }
 110         if (!*p && !*q)
 111             return localencs[i].charset;
 112     }
 113
 114     return CS_NONE;                    /* not found */
 115 }
 116
 117 int charset_localenc_nth(int n)
 118 {
 119     int i;
 120
 121     for (i = 0; i < (int)lenof(localencs); i++)
 122         if (localencs[i].return_in_enum && !n--)
 123             return localencs[i].charset;
 124
 125     return CS_NONE;                    /* end of list */
 126 }